lang/ghc: Continue with cleanups

- Move pkg-plist.hadrian into pkg-plist. Everything is build with Hadrian now
- Fix building without GMP option

lang/ghc/Makefile

@@ -116,7 +116,6 @@ HADRIAN_CMD=		${WRKSRC}/hadrian/bootstrap/_build/bin/hadrian ${HADRIAN_DOCS_ARG}
 DO_MAKE_BUILD=		${SETENVI} ${WRK_ENV} ${HADRIAN_CMD} ${_MAKE_JOBS} --flavour=ports
 ALL_TARGET=		binary-dist-dir
 INSTALL_WRKSRC=		${WRKSRC}/_build/bindist/ghc-${GHC_VERSION}-${CONFIGURE_TARGET}
-PLIST?=			${.CURDIR}/pkg-plist.hadrian
 
 .if (empty(PORT_OPTIONS:MDYNAMIC) || empty(PORT_OPTIONS:MPROFILE))
 IGNORE=			Building with Hadrian requires both DYNAMIC and PROFILE for now

lang/ghc92/Makefile

@@ -24,6 +24,6 @@ BOOT_LLVM_VERSION=	12
 
 MASTERDIR=	${.CURDIR}/../ghc
 PATCHDIR=	${.CURDIR}/files
-# PLIST for this port is set in the master one
+PLIST=		${.CURDIR}/pkg-plist
 
 .include	"${MASTERDIR}/Makefile"

lang/ghc94/Makefile

@@ -23,6 +23,6 @@ BOOT_LLVM_VERSION=	12
 
 MASTERDIR=	${.CURDIR}/../ghc
 PATCHDIR=	${.CURDIR}/files
-# PLIST for this port is set in the master one
+PLIST=		${.CURDIR}/pkg-plist
 
 .include	"${MASTERDIR}/Makefile"

lang/ghc96/Makefile

@@ -23,6 +23,6 @@ BOOT_LLVM_VERSION=	12
 
 MASTERDIR=	${.CURDIR}/../ghc
 PATCHDIR=	${.CURDIR}/files
-# PLIST for this port is set in the master one
+PLIST=		${.CURDIR}/pkg-plist
 
 .include	"${MASTERDIR}/Makefile"